Grinding-mill



UNiTED sfrarns ra onirica.

JOHN RUOF, ANTHONY HEUPEL, AND FRANK LEUTHY, OF LANCASTER, PENNSYLVANIA.

GRINDING-MILL.

Specification of Letters Patent No. 29,010, dated July 3, 1860.

To all whom it may concern:

Be it known that we, JOHN Ruor, AN- THONY HEUPEL, and FRANK LEUTHY, allof Lancaster, in the county of Lancaster and State of Pennsylvania, haveinvented a new and Improved Grinding-Mill; and we do hereby declare thatthe following is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, making a part of thisspecification, in which- Figure 1, represents a vertical transversesection taken through the middle of the improved mill. Fig. 2, shows thedress of the grinding disks. Fig. 3 a section taken horizontally throughthe lower spindle of Fig. 1, as indicated by the red line markedthereon.

Similar letters of reference indicate corresponding parts in the threeviews.

This invention consists in a novel manner of laying olf the dress of themill stones so that they will more effectually grind grain, and thequantity ground will be increased with a given power, producing a betteryield of flour and avoiding both the choking and undue heating of thest-ones as will be hereinafter set forth.

To enable those skilled in the art to fully understand our invention, wewill proceed to describe its construction and'operation.

In the drawings, A, A, represent respectively the cup and bottomportions, that with the ring or curb B, form the body of the mill. Thisbox is supported by three legs C, one of which will serve, if a band isnot used, for supporting the driving shaft but in the present case themill is driven by a belt from any convenient prime mover. Through thetop of the cap A, passes a hollow shaft D, that has its bearings on thetop of a collar a, and is hung by a ring b, (Fig. l) D, is the hopperinto which the grain is supplied. The hollow shaft passes downeccentrically through the cap A, and it carries the upper grinding plateE, which is made of cast iron, and the grain in its passage to thegrinding surfaces from the hopper D escapes from the shaft D, at thecenter of the grinding plate, and a little to one side of the axis ofthe lower grinding plate F, as clearly shown in Fig'. 1. This runner orlower plate F, is set on the end of a perpendicular shaft G, and keyedto this shaft which gives motion to the ruimer. The

faces of the two grinding plates are parallel to each other in ahorizontal plane, and they have a very peculiar dress which is formed incasting them. v

The dress is represented in Figs. 1 and 2, and it is laid ofi' in triplehelical grooves c, c, c2, that start quite deep at the center or eye ofthe plate as shown in Fig. 1, and running gradually shallower andnarrower as they approach the circumference of the plates; both platesare dressed alike. The motion given to the lower plate when the grain isproperly supplied to the hopper will cause the upper plate to rotatealso, but as the two plates are placed to one side of a vcommon axis,their action upon the grain will be to reduce it rapidly and properly,and deposit it from the circumference of the plates on the bottom plateI-I, from which it is scraped to escape-spout I, by an arm or wing Theshaft G, passes down through the center of the lower portion A. This hascast on it a tube it, the inside of which is conical as represented inFig. 1, and in this conical bore is placed a metal box J, of brass orother metal that serves for side bearings, to keep the shaft true, andthe grinding surfaces of the plates parallel to each other. The outsideof the box is made conical and slightly larger than the bore into whichit fits, and the box is made in two longitudinal halves as shown in Fig.3, each of which is prevented from turning with the shaft G, by a keytenon that fits into a mortise or groove in the bore of tube it, asshown in Fig. 3. The bottom of the box rests on an adjustable plate 7c,which may be raised or depressed, for tightening or loosening the boxaround the shaft G, by moving the set screws z', z".

The shaft G is stepped in a block K, that is placed within a tube orsocket L, transversely through the bottom of which, passes an adjustablewedge N, on which the step block K, rests.

By moving the wedge back or forth, the surfaces of plates E, F, may bebrought nearer together or farther apart while the mill is in operationif desirable. The wedge is operated by a screw m, that passes through astationary piece n.

P, is a flanged drum, keyed to shaft G, around which the driving belt ispassed, and below this drum on the shaft, is placed a balance Wheel R,to equalize the motion of scribed and represented for the purposes setthe mill. forth.

Having thus described our invention, what JOHN RUOF. We claim as new,and desire to secure by Let- ANTHONY HEUPEL. 5 ters Patent isd FRANKLEUTHY.

The two plates E, F, arranged and operat- Witnesses: ing as describedWhen their dress is laid off LEWIS ZECHER, Jun.,

in spiral eccentric grooves c, o', 02, as de- WILLIAM FRICK.

